Missed DIT Questions

Question 1

what 7 muscles and 2 nerves derived from 1st branchial arch

Answer 1

1. temporalis
2. masseter
3. mylohyoid
4. lat. and medial pterygoids
5. ant. belly of digastric
6. tensor tympani
7. tensor veli palatini

• CN V2 and V3

Question 2

what 2 a.a. found in high conc in elastin

Answer 2

1. proline
2. glycine

• non hydroxylated
• by contrast, collagen has proline, glycine and lysine; proline and lysine become hydroxylated

Question 3

MOA of adenosine as an antiarrhythmic

Answer 3

increases K efflux from the cell (hyperpolarization) and initally prevents Ca entry, which stops SA node conducton

*very short acting (15s) will stop the heart, used to dx SVTs